Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6638868 | Fuel | 2014 | 6 Pages |
Abstract
A method proposed by Bouyssiere et al. [3] for mercury speciation in gas condensates by GC-ICP-MS was investigated for the determination of Hg2+ (as inorganic mercury) and MeHg+ in crude oil samples. The Grignard reaction conditions and instrumental parameters were optimized. The original volume (0.5 mL) of the Grignard reagent was duplicated, and a sample/toluene ratio of 1:19 was used to avoid the total consumption and/or destruction of the Grignard reagent by the components of the oil matrices. Furthermore, the split injection mode was applied. When BuMgCl was used for the derivatization reaction, a limit of detection of 0.03 μg Lâ1 Hg2+ was obtained. Precision was always better than 12%. Quantitative recoveries (80-117%) of Hg2+ (as MeBuHg and Bu2Hg) were obtained for the determination of MeHg+ and inorganic mercury in spiked samples, respectively. Besides BuMgCl, other Grignard reagents such as MeMgCl, EtMgCl and PrMgCl can be used for the determination of Hg2+ as inorganic mercury and MeHg+. Moreover, mercury species such as Me2Hg, MeEtHg, Et2Hg, Pr2Hg and MePrHg can be determined by direct injection into the CG-ICP-MS using Bu2Hg standard solutions for external calibration.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Fernanda Veronesi M. Pontes, Manuel C. Carneiro, Delmo S. Vaitsman, Maria Inês C. Monteiro, Arnaldo A. Neto, Maria LuÃza B. Tristão,